• Title/Summary/Keyword: Common rail diesel engine

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A Study on the Performance Characteristic of Common Rail High Pressure Pump (커먼레일 시스템용 고압펌프의 성능 특성에 관한 연구)

  • Lee, Choon-Tae
    • Journal of Power System Engineering
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    • v.17 no.6
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    • pp.5-10
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    • 2013
  • Diesel engines have the advantages of good fuel efficiency and low emissions. Therefore, car makers have been developed various kinds of diesel engine management system to clean up emissions while improving fuel efficiency. One of them is the common rail system. In the common rail system, diesel fuel is injected into the combustion chamber at ultra high pressures up to 1,800 bar to ensure more complete combustion for cleaner exhaust gas, and highly precise multiple injection reduces NOx emission, combustion noise and vibration. Generally speaking, common rail system consists of booster pump, high pressure pump, common rail, injectors, control valves, and sensors. The high pressure pump receives low pressure fuel from the booster pump and supply high pressure fuel to injectors through the high pressure common injection rail. Therefore, high pressure pump has an important role in common rail system. In this paper, we have investigated the performance of high pressure pump of common rail system.

A Control Strategy of Fuel Injection Quantity and Common-rail Pressure to Reduce Particulate Matter Emissions in a Transient State of Diesel Engines (승용디젤엔진의 과도구간 입자상물질 저감 및 운전성능 향상을 위한 연료분사량 및 커먼레일압력 제어전략)

  • Hong, Seungwoo;Jung, Donghyuk;Sunwoo, Myoungho
    • Transactions of the Korean Society of Automotive Engineers
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    • v.23 no.6
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    • pp.623-632
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    • 2015
  • This study proposes a control strategy of the common rail pressure with a fuel injection limitation algorithm to reduce particulate matter (PM) emissions under transient states. The proposed control strategy consists of two parts: injection quantity limitation and rail pressure adaptation. The injection limitation algorithm determines the maximum allowable fuel injection quantity to avoid rich combustion under transient states. The fuel injection quantity is limited by predicting the burned gas rate after combustion; however, the reduced injection quantity leads to deterioration of engine torque. The common rail pressure adaptation strategy is designed to compensate for the reduced engine torque. An increase of the rail pressure under transient states contributes to enhancement of the engine torque as well as reduction of PM emissions by promoting atomization of the injected fuel. The proposed control strategy is validated through engine experiments. The rail pressure adaptation reduced the PM emission by 5-10% and enhanced the engine torque up to 2.5%.

Characteristics of Durability and Emission with Biodiesel Fuel (5%) in a Common Rail Direct Injection Diesel Engine at SEOUL-10 Mode (SEOUL-10 모드에서 바이오디젤유 (5%) 적용시 커먼레일 디젤기관의 배기배출물 및 내구 특성)

  • Choi, S.H.;Oh, Y.I.;Kim, G.H.
    • Journal of Biosystems Engineering
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    • v.32 no.2 s.121
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    • pp.97-101
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    • 2007
  • A CRDI diesel engine used to commercial vehicle was fueled with diesel fuel and 5% biodiesel blended fuel (BDF 5%) and tested at the Seoul-10 mode for 150 hours. Engine dynamometer testing was completed at regularly scheduled intervals to monitor the engine performance and exhaust emissions. To check the engine parts (valve, injector), the engine was inspected after 150 hours running test. It was concluded that there was no unusual deterioration of the engine, or the changes in engine power (below 2.6%), smoke (below 6.2%), NOx (below 2%) and durability characteristics in spite of operation of 150 hours run with BDF 5%. The difference of kinetic viscosity for engine oil (before and after durability testing) was below 0.36%

Spray and Combustion Characteristics of DME and Diesel Fuel in a Common-Rail Diesel Engine (커먼레일 디젤엔진의 DME와 디젤연료의 분무 및 연소 특성)

  • Kim, Myung-Yoon;Ha, Sung-Yong;Lee, Chang-Sik
    • Journal of ILASS-Korea
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    • v.12 no.1
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    • pp.30-37
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    • 2007
  • Dimethyl ether (DME) as an alternative fuel for compression ignition engine was investigated by measuring spray development processes, injection rate profiles, engine performance, and exhaust emission characteristics. The results of DME fueled engine were compared with those obtained by fueled with diesel. The experimental results showed that DME has approximately 0.03ms shorter injection delay and higher maximum injection rate than those of diesel fuel at a constant injection pressure of 50MPa. The spray visualization indicates that DME has shorter spray tip penetration due to its low density and faster evaporation. The combustion characteristics of DME operated engine provided faster ignition delay and three times shorter combustion duration. It is believed that the better evaporation and atomization characteristic of DME contributes the faster combustion. At all operating condition, soot emission was not detected due to the clean combustion of DME.

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Spray and Combustion Characteristics of Diesel and JP-8 in a Heavy-Duty Diesel Engine Equipped with Common-Rail Fuel Injection System (커먼레일을 장착한 대형 디젤엔진에서 디젤과 JP-8의 분무 및 연소특성 평가)

  • Jeon, Jin-Woog;Lee, Jin-Woo;Park, Jung-Seo;Bae, Choong-Sik
    • Proceedings of the KSME Conference
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    • 2008.11b
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    • pp.3019-3025
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    • 2008
  • An experimental study was performed to assess the effect of diesel and JP-8 aviation fuel on the spray characteristics, performance and emissions in a single cylinder optical diesel engine. Both fuels were injected via an 8-hole solenoid-driven injector in a common-rail injection system. For better understanding of spray development, the macroscopic images were captured with high speed camera, offered evidences for the results of performance and emissions. From macroscopic spray images, the spray tip penetration of JP-8 shorter than that of diesel while spray angle of JP-8 was wider than that of diesel. It indicates that the vaporization of JP-8 is superior to that of diesel. The lower cetane number of JP-8 resulted in increased portion of premixed combustion. The IMEP with JP-8 is lower than that of diesel-fueled engine. Especially, using JP-8 has a potential for reducing soot.

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Combustion Characteristics of Common Rail System by Using a Heavy Duty Transparent Engine (Common Rail을 이용한 대형 디젤 가시화엔진에서의 연소특성)

  • Kim, Y.M.;Lee, J.H.;Kim, S.H.;Lee, W.G.;Hong, C.H.;Choi, B.C.
    • Proceedings of the KSME Conference
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    • 2001.06d
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    • pp.896-902
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    • 2001
  • To meet strict emission regulation while improving engine performances, common rail injection system which is suitable for electronic control, and capable of controlling injection quantity, timing, rate and pressure individually as well as realizing high pressure has been developed. At present study, a 8L DI diesel engine was converted to a single-cylinder experimental engine allowing optical access through an extended piston and a prototype of common rail injector in progress was applied to the engine. The combustion characteristics of the engine were analysed by using direct images and characteristics of the injector were analysed. We can not say that the results are always the same to general common rail injection system but that they are just characteristics of specific prototype injector.

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An experimental study on exhaust gas variation depending on EGR rate of common rail engine (커먼레일엔진 EGR RATE에 따른 배기가스 변화에 대한 실험적 연구)

  • Kim, Jin-Yong;Na, Byung-Chul;Lee, Kye-Cheul;Seo, Joon-Ho
    • Proceedings of the KSME Conference
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    • 2004.04a
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    • pp.2167-2172
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    • 2004
  • Current common rail engines are equipped with cooled EGR systems by using an engine cooling water system. In this study, investigations of exhaust gas reduction characteristics have been carried out in the common rail engine system depending on the EGR rate variation. The experimental results shows that NOx reduces and smoke increases as the EGR rate increases.

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Comparison of Pilot Spray Characteristics of HP Diesel Injectors with Different Driving Method for CRDi System (II) (커먼레일 직접분사(CRDi)용 고압 디젤인젝터의 구동방식별 Pilot Spray 특성비교(II) - 솔레노이드 및 피에조 구동방식 비교분석 -)

  • Lee, Jin-Wook
    • Journal of ILASS-Korea
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    • v.15 no.2
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    • pp.67-73
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    • 2010
  • The capability of pilot injection with small fuel quantity at all engine operating conditions is one of the main feature of the common rail direct injection system. The purpose of the pilot injection is to lower the engine noise and to reduce the NOx emissions. This study describes the pilot spray structure characteristics of the common-rail diesel injectors with different electric driving characteristics, including solenoid-driven and piezo-driven type. Namely three common-rail injectors with different electric current wave were investigated in this study. The pilot spray characteristics such as spray speed, spray tip penetration, and spray angle were obtained by spray images, which is measured by the back diffusion light illumination method with optical system for high-speed temporal photography. As this research results, it was found that pilot injection of common-rail system was effected by rate of injection with different electrical characteristic for injector driving.

Comparison of Pilot Spray Characteristics of HP Diesel Injectors with Different Driving Method for CRDi System (I) (커먼레일 직접분사(CRDi)용 고압 디젤인젝터의 구동방식별 Pilot Spray 특성비교 (I) - 실제 직접분사식 디젤엔진에서의 사전분사 특성 분석 -)

  • Lee, Jin-Wook
    • Journal of ILASS-Korea
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    • v.15 no.1
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    • pp.25-30
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    • 2010
  • The capability of pilot injection with small fuel quantity at all engine operating conditions is one of the main feature of the common rail direct injection system. The purpose of the pilot injection is to lower the engine noise and to reduce the NOx emissions. This study describes the pilot spray structure characteristics of the common-rail diesel injectors with different electric driving characteristics, including solenoid-driven and piezo-driven type. Namely three common-rail injectors with different electric current wave were investigated in this study. The pilot spray characteristics such as spray speed, spray tip penetration, and spray angle were obtained by spray images, which is measured by the back diffusion light illumination method with optical system for high-speed temporal photography. As this research results, it was found that pilot injection of common-rail system was effected by rate of injection with different electrical characteristic for driving the injector.